Illegal base64 data

[Thanzex]

Hi there!
I just stumbled upon this project, i'm exporting my Google Authenticator data but I cannot make this package work.
According to what I read and what this app expects, the link data should be B64 encoded, however, mine contains many / and +,
this is my anonimized link.
otpauth-migration://offline?data=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx/xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx+xxx+xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx/////xx==
Any idea on what I should do?

[dim13]

This looks like a valid standard base64 encoding. Which error do you get?