It is possible that the Google Analytics <> Google Ads integration is active unilaterally. Opteo won't consider it active unless both entities are sending and receiving data. To check this:
Make sure you have admin permissions for both accounts.
Head to Google Analytics > Admin > Product Linking > Google Ads Linking in the Property column:
Create a new link group, select the Google Ads account to link, give it a title and be sure to switch on at least one 'View':
From the Google Ads side, go to Tools > Setup > Linked Accounts > Google Analytics, then click Link. You should also see this 'View' button:
Make sure 'Import site metrics' is also enabled. You should also make sure that there is only one active linked analytics property. If there is more than one, then disable all but one:
The last check is back in Google Ads. You need to see if Google Analytics data is available as a column:
If you can see the Google Analytics columns, then the integration should work in Opteo.