Using SFOS 4.0.1.48 on Sony XA2 Ultra, I can create and use nextcloud as long as 2FA is not set on the nextcloud account. Once 2FA is set, Sailfish does not request for OTP and only provides a login error.
Can this (OTP prompt) be available on the next update?
You do not need the OTP data. For this problem applications like Nextcloud have a token system:
In Nextcloud go to settings -> security. There you find the part devices & sessions. There you can create an app password for your Sailfish session.
I should have thought of this. This solved the login issue for me. Thank you so much for your response. Take care.