Repeated Error logging in

[Murdee]

I am consistently getting an error when I try to log out of one account and log into another - userSessionMismatch userId provided does not match user associated with session token - it's not something that happened until the site stopped allowing logins via phone number and started using email instead. I can log in fine if I use an incognito window or if I delete cookies but it's not a longterm solution, can something be done about it?

[Three_Niall]

Hey @Murdee thanks for posting here, if you are the owner of both accounts my recommendation would be to register both numbers under the one login/email and you can switch between accounts and you can view how to complete this here 
How to: Add Another Number on My3. 

As your login's are working and this seems to be related to the cookies on the browser the only other recommendation I would have is to try another browser or allowing sometime between switching between accounts to see if this helps also.