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Message "422 Validation failed: Username has already been taken" shows up when trying to follow users on instances that are running on different versions #4626
I'm on im-in.space and it's running on v. 1.5.1. In the last couple of days, I noticed I couldn't follow some users -- this action prompted the message "422 Validation failed: Username has already been taken". While talking about this with im-in.space's admin, awoo.space's admin suggested it could be some kind of incompatibility between releases. Looking for the instances with which I experienced this error, I found out they're running on v. 1.4.7.
referenced this issue
Sep 8, 2017
This also appears to be happening between toot.cafe and social.coop, even though both are on 2.0.0.
Reported here: https://toot.cafe/@flakoot/98905852846736242