if you set the user separately you can use the general webdav endpoint, small helper for password:
[mur]
type = webdav
url = https://murena.io/remote.php/webdav/
vendor = nextcloud
user = username@domain # with domain being critical if your primary-id resides with e.email or murena.io
pass = # paste the result of 'echo -n "your app-token or password" | rclone obscure -'