hi,
the security scan got me this high level error:
Suspected malicious code detected in these resources:
https://www.googletagmanager.com/gtm.js?id=GTM-TNNDSCSC
Please ensure all scripts are legitimate.
If you think this is a false positive - please let us know at: securityscan@magento.com
I have magento 2.3 installed, don't know where to check for this,
please help me,
Cris