You can use occ commands:
How to find out, which provider the User use
For Native System:
sudo -u www-data php /var/www/html/occ twofactor:state $username
For Docker:
docker exec -u www-data nextcloud-aio-nextcloud php /var/www/html/occ twofactor:state $username
For example you get “totp” the Provider is “totp”
OCC Command to disable 2fa for a User
Native System
sudo -u www-data php /var/www/html/occ twofactor:disable $username $provider_id
Docker
docker exec -u www-data nextcloud-aio-nextcloud php /var/www/html/occ twofactor:disable $username $provider_id
You need to change the path of your installation, if your location is another.
If you not use Nextcloud AIO you need to change the Container Name of the Nextcloud Container.
Admin i wouldnt enforce 2FA, cause you can have problems in some cases.