getting device authorization flow info failed with error: failed while getting Management Service public key when connect to self-host server

[nitezs]

Describe the problem

sudo netbird up --management-url xxx --admin-url xxx
2024-12-18T11:54:06+08:00 WARN client/cmd/root.go:245: retrying Login to the Management service in 690.220108ms due to error rpc error: code = Unknown desc = getting device authorization flow info failed with error: failed while getting Management Service public key
2024-12-18T11:54:09+08:00 WARN client/cmd/root.go:245: retrying Login to the Management service in 2.199479217s due to error rpc error: code = Unknown desc = getting device authorization flow info failed with error: failed while getting Management Service public key
2024-12-18T11:54:13+08:00 WARN client/cmd/root.go:245: retrying Login to the Management service in 1.967353557s due to error rpc error: code = Unknown desc = getting device authorization flow info failed with error: failed while getting Management Service public key
2024-12-18T11:54:17+08:00 WARN client/cmd/root.go:245: retrying Login to the Management service in 2.356804163s due to error rpc error: code = Unknown desc = getting device authorization flow info failed with error: failed while getting Management Service public key
2024-12-18T11:54:21+08:00 WARN client/cmd/root.go:245: retrying Login to the Management service in 5.196377811s due to error rpc error: code = Unknown desc = getting device authorization flow info failed with error: failed while getting Management Service public key
Error: login backoff cycle failed: rpc error: code = Unknown desc = getting device authorization flow info failed with error: failed while getting Management Service public key

Solution
If you encounter this problem, you might be connecting a netbird server behinding cloudflare CDN. Just turning on gRPC in cloudflare network tab, the problem might be solved.
writing down to help someone in need.