Twenty years ago, I worked for Google AdWords as a customer service rep. This was still relatively early days, and all ads still had some level of manual human review.

The big advertisers had all furnished us a list of their trademarks and acceptable domains. Any advertiser trying to use one that wasn’t on the allow-list had their ad removed at review time.

I suspect this could be what happened to you. If the platform you were using has any kind of review process for new shops, you may have run afoul of pre-registered keywords.