Error itgenlic402 when trying to connect from Excel add-in

Hello, I previously defined some Excel links which were working fine. Now, however, I am receiving these error messages below. We already have a subscription:

itgenlic402
Invantive Control for Excel can not be used due to the previously shown message.
Warning itgenlic402:
This data container has been uesd in a trial that started 156 days ago.
Please switch to a non-trial subscription within 6 months after first use.
This is currently a warning only.
Connection to this data container will no longer be possible starting 07-05-2026.

itgenuty726
A connection to the database … could not be established as user …
Provide value on ‘System.Windows.Markup.StaticResourceHolder’ threw an exception.
The method or operation is not implemented.

I tried again, and now also get this message:

itgeneor823
A connection to the database … could not be established as user …
The OAuth access token for Exact Online has expired or is currently not accepted.
The access token has expired.
The remote server returned an error:
(401) Unauthorized.
Please check that Exact Online is online.
Try again later when Exact Online is offline.
Re-authenticate on Exact Online when online and the access token is still not accepted.
https://start.exactonline.nl/api/v1/current/Me

Can someone advise what I should do?

It is recommended to click on the hyperlink in the first error window directly below “Related forums topics:”. This will lead to the topic:

The next step is to replace the trial license key by the license key for your company. The related topic explains how to do this.