If you cannot log into your account anymore and used to have a
valid Riseup account, chances are your account has been deactivated.
After a certain amount of time, inactive accounts are disabled.
Eventually, if it is not reactivated, the account is deleted. Deleted
account names are kept in a reserved names list and won't be available again.
To reactivate your
account, you can log in at https://account.riseup.net. If you can log in
successfully, your account has been reactivated. If not, chances are it
has been deleted. If that is the case, sadly there is nothing we can do
for you.