I get error 10 after successfully accepting a regify invitation
This means that you opened a valid invitation but the box owner decided to remove you from the list of allowed users. By this, you can no longer get data and the box is removed from your list. Please ask the regibox owner to invite you again.
I get "Failed to load the box list due to a connectivity issue"
But you have good connectivity? If connetivity is good, please note that in regibox for mobile V2.4.1 an error code for "You are using your old password" is missing and also triggers this error message. Thus, please try to enter the current password of your regify account in the settings to solve the issue.