Sync on tablet not working

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Joplin 2.8.1

Database v41 FTS enabled

Huawei MediaPad M3 Lite 10

I have Jop on a linux system and a mobile.
I am now trying to sync my tablet

Sinc between the linux system (manjaro) and the mobile work well.
However after I have given the app on the tablet permissions and stated the target I then touch "syncronize" on the side bar.

It takes me back to the config screen and I note that "Target" has reverted to "None"

It should take me to the dropbox parameters for me to sign in but never gets there!

Thanks for any help