Hello.
Google support probably told you to check code manually (inspect in Chrome), or check over Search Console (it's Google Search Console, part of Webmaster tools).
I am Google developer certified in Ads and Analytics, and I am able to approve 99% of features in Adwords, if account is under my management...
So, first I have to know have you added your website to Google Search Console?
Second, can I see your Google Ads account (I just need your Customer ID)?
Best regards,
Neven
Additional note
P.S. I just found what is the exact source of the blocking and I can fix it in one hour; However, there is also a few more things to approve, and I can suggest it later, as we fix the first issue.