Facebook campaign error on custom audience creation

Hi,

We have set up the facebook integration according to the integration guide.

In the Campaign, we can successfully authenticate. We can Release the campaign. We can see the Facebook Campaign ID and can navigate to it.

However, when the campaign is executed (custom audience is replicated), the following error occurs;

1 target groups successfully locked.

Rebuild is set up with retention period 8 (unit 'H').

TG 'xxx: Last rebuild not via UI at 07.05.2020, 09:01:19 (vs 0 / CUAN_INITIATIVE).

Last rebuild of TG xxx lies in retention period.

Rebuild of target group "2533471" finished successfully at "07.05.2020, 13:00:55 (CET)".

Usage of marketing areas in campaign execution is activated. See more

Inserted 0 identifiers with origin type email.

Inserted 0 identifiers with origin type phone.

Setting the OAuth 2.0 authorization code token failed with reason: No access token available for current user..

There was a problem creating a custom audience in Facebook.

What could be the problem here?

Kr

Joyca