The problem is that a previously stored account can no longer read/write to your software to synchronize your contacts.
1. Delete the connection (your contacts remain untouched).
2. Disconnect the affected account via this page.
3. Create a new connection. The affected account will be able to be reconnected.
- "Microsoft 365" Account: maybe the user has two-factor authentication enabled. This situation is not yet compatible with sync.blue®.
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