diff --git a/UnitTests/MPIdentityApiRequestTests.m b/UnitTests/MPIdentityApiRequestTests.m
index 404766c4..5de91763 100644
--- a/UnitTests/MPIdentityApiRequestTests.m
+++ b/UnitTests/MPIdentityApiRequestTests.m
@@ -6,6 +6,10 @@ @interface MPIdentityApiRequestTests : MPBaseTestCase
 
 @end
 
+@interface MPIdentityApiRequest ()
+@property (nonatomic) NSMutableDictionary<NSNumber*, NSObject*> *mutableIdentities;
+@end
+
 @implementation MPIdentityApiRequestTests
 
 - (void)testSetNilIdentity {
@@ -24,7 +28,7 @@ - (void)testSetNullIdentity {
     XCTAssertEqualObjects([NSNull null], [request.identities objectForKey:@(MPIdentityOther)]);
 }
 
-- (void)testsetIdentity {
+- (void)testSetIdentity {
     MPIdentityApiRequest *request = [[MPIdentityApiRequest alloc] init];
     [request setIdentity:@"foo" identityType:MPIdentityOther];
     XCTAssertEqualObjects(@"foo", [request.identities objectForKey:@(MPIdentityOther)]);
@@ -49,4 +53,28 @@ - (void)testIdentitiesAreNotNull {
     XCTAssertNotEqualObjects(request.customerId, [NSNull null]);
 }
 
+- (void)testSetEmail {
+    MPIdentityApiRequest *request = [[MPIdentityApiRequest alloc] init];
+    XCTAssertNil(request.email);
+    request.email = @"test@test.com";
+    XCTAssertEqualObjects(@"test@test.com", request.email);
+    XCTAssertEqualObjects(@"test@test.com", request.mutableIdentities[@(MPIdentityEmail)]);
+    
+    request.email = nil;
+    XCTAssertNil(request.email);
+    XCTAssertEqualObjects(request.mutableIdentities[@(MPIdentityEmail)], [NSNull null]);
+}
+
+- (void)testSetCustomerId {
+    MPIdentityApiRequest *request = [[MPIdentityApiRequest alloc] init];
+    XCTAssertNil(request.customerId);
+    request.customerId = @"some id";
+    XCTAssertEqualObjects(@"some id", request.customerId);
+    XCTAssertEqualObjects(@"some id", request.mutableIdentities[@(MPIdentityCustomerId)]);
+    
+    request.customerId = nil;
+    XCTAssertNil(request.customerId);
+    XCTAssertEqualObjects(request.mutableIdentities[@(MPIdentityCustomerId)], [NSNull null]);
+}
+
 @end
diff --git a/UnitTests/MPSwiftTests.swift b/UnitTests/MPSwiftTests.swift
index bf7df30d..b773d705 100644
--- a/UnitTests/MPSwiftTests.swift
+++ b/UnitTests/MPSwiftTests.swift
@@ -64,4 +64,19 @@ class mParticle_Swift_SDKTests: XCTestCase {
         XCTAssertNotNil(MPIdentityErrorResponseCode(rawValue: 500))
         XCTAssertNotNil(MPIdentityErrorResponseCode(rawValue: 502))
     }
+    
+    func testMPIdentityApiRequestIdentitiesInterop() {
+        let request = MPIdentityApiRequest()
+        request.setIdentity("test id", identityType: .customerId)
+        request.setIdentity("test@test.com", identityType: .email)
+                
+        var identities = [NSNumber: NSObject]()
+        identities[NSNumber(value: MPIdentity.customerId.rawValue)] = NSString(string: "test id")
+        identities[NSNumber(value: MPIdentity.email.rawValue)] = NSString(string: "test@test.com")
+        XCTAssertEqual(identities, request.identities);
+        
+        request.email = nil
+        identities[NSNumber(value: MPIdentity.email.rawValue)] = NSNull()
+        XCTAssertEqual(identities, request.identities);
+    }
 }
diff --git a/mParticle-Apple-SDK/Identity/FilteredMPIdentityApiRequest.m b/mParticle-Apple-SDK/Identity/FilteredMPIdentityApiRequest.m
index 69ca3da0..eef38c34 100644
--- a/mParticle-Apple-SDK/Identity/FilteredMPIdentityApiRequest.m
+++ b/mParticle-Apple-SDK/Identity/FilteredMPIdentityApiRequest.m
@@ -37,7 +37,7 @@ - (instancetype)initWithIdentityRequest:(MPIdentityApiRequest *)request kitConfi
 }
 
 - (NSDictionary<NSNumber *,NSString *> *)userIdentities {
-    NSDictionary<NSNumber *, NSString *> *unfilteredUserIdentities = self.request.identities;
+    NSDictionary<NSNumber *, NSObject *> *unfilteredUserIdentities = self.request.identities;
     NSMutableDictionary *filteredUserIdentities = [NSMutableDictionary dictionary];
     
     for (NSNumber* key in unfilteredUserIdentities) {
diff --git a/mParticle-Apple-SDK/Identity/MPIdentityApiRequest.m b/mParticle-Apple-SDK/Identity/MPIdentityApiRequest.m
index 520653e1..55f8049d 100644
--- a/mParticle-Apple-SDK/Identity/MPIdentityApiRequest.m
+++ b/mParticle-Apple-SDK/Identity/MPIdentityApiRequest.m
@@ -11,7 +11,7 @@
 #import "MPIdentityDTO.h"
 
 @interface MPIdentityApiRequest ()
-@property (nonatomic) NSMutableDictionary<NSNumber*, NSString*> *mutableIdentities;
+@property (nonatomic) NSMutableDictionary<NSNumber*, NSObject*> *mutableIdentities;
 @end
 
 @implementation MPIdentityApiRequest
@@ -50,11 +50,11 @@ + (MPIdentityApiRequest *)requestWithUser:(MParticleUser *) user {
 }
 
 - (NSString *)email {
-    NSString *result = _mutableIdentities[@(MPIdentityEmail)];
-    if ([result isEqual:[NSNull null]]) {
-        result = nil;
+    NSObject *result = _mutableIdentities[@(MPIdentityEmail)];
+    if ([result isKindOfClass:[NSString class]]) {
+        return (NSString *)result;
     }
-    return result;
+    return nil;
 }
 
 - (void)setEmail:(NSString *)email {
@@ -62,18 +62,18 @@ - (void)setEmail:(NSString *)email {
 }
 
 - (NSString *)customerId {
-    NSString *result = _mutableIdentities[@(MPIdentityCustomerId)];
-    if ([result isEqual:[NSNull null]]) {
-        result = nil;
+    NSObject *result = _mutableIdentities[@(MPIdentityCustomerId)];
+    if ([result isKindOfClass:[NSString class]]) {
+        return (NSString *)result;
     }
-    return result;
+    return nil;
 }
 
 - (void)setCustomerId:(NSString *)customerId {
     [self setIdentity:customerId identityType:MPIdentityCustomerId];
 }
 
-- (NSDictionary<NSNumber*, NSString*> *)identities {
+- (NSDictionary<NSNumber*, NSObject*> *)identities {
     return [_mutableIdentities copy];
 }
 
diff --git a/mParticle-Apple-SDK/Include/MPIdentityApiRequest.h b/mParticle-Apple-SDK/Include/MPIdentityApiRequest.h
index d1578d45..3f571b9c 100644
--- a/mParticle-Apple-SDK/Include/MPIdentityApiRequest.h
+++ b/mParticle-Apple-SDK/Include/MPIdentityApiRequest.h
@@ -21,7 +21,7 @@ NS_ASSUME_NONNULL_BEGIN
 
 @property (nonatomic, strong, nullable) NSString *email;
 @property (nonatomic, strong, nullable) NSString *customerId;
-@property (nonatomic, strong, nullable, readonly) NSDictionary<NSNumber*, NSString*> *identities;
+@property (nonatomic, strong, nullable, readonly) NSDictionary<NSNumber*, NSObject*> *identities;
 
 @end