Cannot sync Zoho Analytics database

When I'm trying to create a sync with a Zoho Analytics Database, the "Database name" dropdown list is empty.

I have checked into the account details, and the ZSC key is set to "oauth". I supposed this value isn't right, but I cannot find any ZSC in Zoho Analytics.

I then tried to add a new Analytics Account into the MarketingHub Sync services, but the page is blank after clicking "Continue" on the acceptation popup and no account is added.

I have found this documentation page, but it seems outdated :

https://help.zoho.com/portal/en/kb/marketinghub/user-guide/list-management/sync-services/articles/how-to-create-zoho-analytics-sync#When_do_I_change_authtoken_in_Zoho_MarketingHub

Also I don't understand why the sync service is "Powered by Zoho Campaign". What's the relation between the sync services, and how Zoho Campaign is related to the sync between Analytics and MarketingHub?

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