Cloudflare error 526 – Invalid SSL certificate

We have put cloudflare SSL/TSL Full(strict) mode and tested our Live environment for about 1hr. Initially it gave 526 error but then it worked without error.
After testing we have put SSL/TSL full mode again.
And then next day we have put cloudflare SSL/TSL Full(strict) mode again and this time error 526 frequently.
We want to set cloudflare SSL/TSL Full(strict) mode but we cannot because of this error.

I have the same issue everytime the server needs to update ssl

That error is quite clear: The SSL certificate you have on your server is not valid for your domain.

To display the origin certificate (assuming one is installed), replace ** below with the actual IP address of your origin web server and replace with your domain and host name:

curl -svo /dev/null --connect-to :: 2>&1 | egrep -v "^{.*$|^}.*$|^* http.*$"

I check this command, but don’t have solutions.

Any output from it?

Still have the same issue

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