Thanks, Pete, I was able to log in to the main system (amen) but I still can't access the DefaultApplication.
I messaged Support who told me to search the forum :/
I found this, which didn't really help, maybe it will help you:
You need to reset the default password using the database tools. The following value below corresponds to the "password" password:
5f4db43b5ad965aa1dfd27a2c8feb1e7
You need to change the Password column in the DefaultBusinessSpaceName_RegularUser table of the BASDB database:
UPDATE DefaultBusinessSpaceName_RegularUser WHERE Password='5f4db43b5ad965aa1dfd27a2c8feb1e7'
where DefaultBusinessSpaceName is the name of your default business space.