How to clear my certificate provisonig is has wrong subject and changing my primary domain

the provisioning certificated has wrong subject (*.netlify.app and netlify.app) my website is flagged as not secure and also I need to change my provisioning certificate to be able to change my primary domain, so basically I just need to clear my provisioning certificate, change my primary domain, and request a new certificate, I already set properly the dns in my external dns provider. thank you in advance, I need to solve this issue as soon as possible. I am looking forward for any help.

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