Getting error while trying to sync with Nextcloud

I've got an answer from the service that manages our cloud (who says he's swamped with work and will look a bit deeper into it when he'll have time) : he says that our cloud uses synchronization clients which delegates the authentication to the service's Central Authentication Service.
His hypothesis is that Joplin synchronization tools does not delegate the authentication to the CAS.
Is this a valid hypothesis ?
How to test it ?
What could be done then ?

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