Having this issue - have tried to sign out from nabu, delete the .cloud folder and reboot (full power off and on) - using an intel NUC - still getting this and unable to connect to HA remotely through nabu.
A few weeks ago a broken update to nodered caused me to have to roll back to a backup a few days old, then backup my NR config, before rolling back to the backup of the broken state, updating NR to the fixed version and then restoring the NR backup file. All has been well - until now. I mention this as others in this thread link had the same issue.
Have sent a ticket into nabu support - but as it’s the weekend, reaching out here as well.
Thanks