Lavenderbeard on Insiders

Ahoy pirates, I need your help.
Recently I've started getting Lavenderbeard/Ashenbeard errors in the live version of SoT. I've learned how to manage this by deleting my credentials for the game whenever it happens. Annoying, but it works. However now this issue has carried over into Insiders and I'm not sure which credentials I need to delete for that. I'm apprehensive about deleting these types of files unless I 100% know what I'm doing, so any help would be appreciated.