Not sure why your insurance thinks a page of your tax return "proves" that you are married. If you filed a joint tax return with your spouse, the first page of your Form 1040 shows that you are filing as married filing jointly. Look at your Filing Status on page 1.
https://ttlc.intuit.com/turbotax-support/en-us/help-article/import-export-data-files/save-2021-turbo...
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