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I understand your frustration with the MediaConvert access issue. Based on the error message you're receiving, it appears your account may need to be provisioned for MediaConvert access.
If you're using AWS Managed Services (AMS), you'll need to request access by submitting a specific change type request to provision the necessary IAM roles for MediaConvert. This process provisions two roles: one for authoring MediaConvert jobs and another default role that MediaConvert uses to read from source S3 buckets, write to destination buckets, and invoke API gateways for digital rights management if needed.
However, if you're using a standard AWS account (not AMS), the "AWS Access Key Id needs a subscription for the service" error typically indicates one of the following:
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Regional availability: MediaConvert may not be available in the region you're attempting to use it in. Ensure you're working in a region where MediaConvert is supported.
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Account activation: Some AWS services require explicit activation or acceptance of service terms before first use, even with proper IAM permissions.
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Service quotas or restrictions: New accounts sometimes have temporary restrictions on certain services.
Since you've already verified your IAM roles, S3 buckets, and permissions are correct, and support has been unable to resolve the issue through standard troubleshooting, I recommend specifically asking AWS Support to verify whether MediaConvert service activation is complete for your account and region, and whether there are any account-level service restrictions that need to be lifted for your new account.
Sources
Use AMS SSP to provision AWS Elemental MediaConvert in your AMS account - AMS Advanced User Guide

Dear Support Team, I have submitted three support cases, but I have not received any response so far. I check daily with hope, but there has been no update. Since March 3rd, I have been trying to use the MediaConvert service, and I am unable to work without it, which is causing significant delays. I would greatly appreciate it if someone could urgently review my cases and my account to help resolve the issue. Thank you very much for your assistance.