Google AdWords set up blocked

May I suggest looking into below article regarding error 1020:

Kindly, may I ask you to check your Firewall Events tab if any appear? You can find the specific one by looking for the value of the Ray ID.
You may need to go through the blocked requests and check if they match Google requests, for example user- agent, IP address, etc.

May I ask do you use some custom-made Firewall Rules, or have restricted access to your Website by country, or some other?
Maybe blocking the AS numbers or IP address range(s)?

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