Unable to submit Data Use Checkup tried serval times and still the same please help

Hello,
I met all requirements to become a tech provider, was granted the following permissions: whatsapp_business_management, whatsapp_business_messaging, but I still can't fully onboard clients. At the end of the WhatsApp embedded signup flow, I see that everything is validated and that I should be able to communicate on behalf on my client.
However, when I go WhatsApp phone numbers in my business manager, I can see that the waba linked to my business has "unavailable" phone number. It's said that I should download the certificate, but I can't download it, instead I have this message: The certificate is not available for your business. Only the business solution provider who manages integration with the WhatsApp Business Platform will be able to download the certificate.
I also see that I am unable to send message to this phone number on WhatsApp.
Am I missing something?

Despite having answered all questions regarding violations in the app review and resolving them, the app remains restricted. To restore the app, please address the following unresolved violations. However, there are no unresolved issues. In this state, there is no flow to lift the restriction. Is this a bug?

I am not clear on where the policy was violated, so I don't know what to do. I have already removed all advertisements from the app and have appealed three times, but each time the response is the same, stating that I am still in violation. I cannot contact customer service, and I hope that customer service can help resolve this issue. It is very important for me and my company. If it cannot be resolved, the entire team will suffer significant losses. My app ID is: 863609455494933

How are folks able to deal with contacting Meta when they are unable to get a fair app review? We are continually going back and forth with different reviewers and this has happened dozens of times in the last few months. These reviewers seem completely incompetent and unable to give even basic feedback about their review. Unable to follow instructions or a simple screencast and just blatantly disable apps because of it. At this point we may need to stop working with Meta completely, it's gotten that bad that I don't know how other developers are able to manage it. Have others seen the same issues?