Primary Thunderbird password failed to import from Desktop to Android

After downloading Thunderbird for Android onto my mobile, I imported email accounts and settings (all, including passwords) from the desktop´s Thunderbird to the phone´s Thunderbird by scanning the desktop´s QR codes. I got all the accounts and messages onto the mobile but not the primary password. On the desktop I still have to log into Thunderbird but not so on the mobile. There is also no way to set a primary password in Thunderbird for Android since it only displays General Settings. Thunderbird for Android does receive emails so it seems to know the passwords to the servers. I have the newest versions of Windows 10 and Android. Any help on how to import or set the primary password in Thunderbird for Android would be greatly appreciated.