Hi Ágnes ,
Thank you for contacting the IMA SDK support team.
By reviewing your concern, I understand that you are facing issues with measuring the viewability when Google ADM tags are used as 3rd party tags in another ad-server.
If not already done, I would suggest you refer to the documents Get started using JWPlayer and Active View measurement to get more information.
I would like to request you to provide the following details to further investigate the issue:
Please provide below stream details
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request.omidAccessModeRules = {};
request.omidAccessModeRules[google.ima.OmidVerificationVendor.OTHER]
= google.ima.OmidAccessMode.FULL;
Please let me know if you have any additional questions.
Thank you,
IMA SDK team