Edge sync fails after restart — MSA key error

I have exactly the same problem. I never had any sync issues before. This started only recently, after years of Edge Sync working normally.

After a Windows restart, Edge remains stuck on "Syncing…" indefinitely. Existing bookmarks are still visible, but any new bookmark I add is not synced to my other devices (including iPhone).

I found a reliable workaround:

• Before shutting down or restarting Windows, I sign out of my Edge profile.
• I restart Windows.
• I sign back into Edge.

After doing this, sync works again.

If I keep the Edge profile signed in when Windows restarts, the issue returns and Edge stays stuck on "Syncing…".

I can reproduce this behavior consistently.

From edge://sync-internals, I observed the following states while the issue is occurring:

• Transport State: Initializing
• Sync Engine: NotStarted
• DataType Manager: State: Stopped
• Download Key Result: Fail
• Set Key Result: Fail

At the same time:

• Sync Account Type: MSA
• Authentication succeeds
• Tokens are obtained successfully
• Existing bookmarks are downloaded from the cloud

However, new bookmarks created on the device are not uploaded and never reach my other devices.