Access to the OAuth data source requires a valid access token

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It is recommended to start of with the suggested step in the error screen:

Please log on to Invantive Cloud and renew the authorization on the data container with alias ‘eol’.

In case that does not work, please read:

Easier renewal of authorizations on Invantive Cloud itgenscr652, itgeneor559 or itgeneor562)

Go to Dutch version Smoothly Repair Authorization Data Containers A common problem is the expiration of authorizations on a limited number of cloud platforms. This is typically linked to an itgenscr652-message. Renewing the authorizations required at least four steps. The new Invantive Cloud release makes the renewal of authorizations much easier and limits it to 1 click in most cases. After logging into Invantive Cloud, the dashboard immediately shows when data containers are in need of repair…

Or follow the hyperlinks with knowledge for this error below the error message in the screen (when present).