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When I'm trying to preview and debug the marketing pixel tags for my website in Google Tag Manager, I immediately see the message
Preview Confirmation
You are no longer in preview mode for any version of container GTM-XXXX
and I'm unable to preview and debug my site. What is going wrong here?
According to this answer in the Google Product Forums, you will get the above message immediately if you have 3rd-party cookies blocked in your browser:
same happend to me until I enabled to accept 3rd partie cookies in firefox!
If you unblock 3rd-party cookies or somehow make an exception rule for Google Tag Manager in your browser, then the preview and debug should work properly.
