I can not change my password

[LeonMarcelHD]

You can follow the steps in this post to solve the issue. It also explains why this error occurred in the first place.

Email or passwored change (gcm: tag doesn’t match)

I took us ages and this topic came up at least twice in a week and we absolutely had no clue. But now we found out why this happens. We assume very old client versions are used for these accounts. Years ago (yes more than 5 years) the encryption was updated and the website requires that new encryption and fails because old clients still use the outdated encryption. Solution: Download and use the latest client: TS5 beta77 or TS 3.6.2 Login into that client Be aware that this step may req…