I used twenty "v0.41.5" from a blank database. I run the database command :
yarn database:init:prod
yarn database:init:prod
Everything looked OK. I created a workspace with a Gmail account. I used another gmail account and tried to join the workspace created, with the workspace invite link I got an error telling me that "This user does not have access to this workspace".
I deleted the database "default", created it, granted all privilege to the twenty user. Downgraded the twenty version to "v0.40.8" Repeated these steps from above, and I was able to join the workspace.