Jetpack connection problems

Hi,

I’ve tried some of the ealier solutions because I see this is a commen problem, but there are no spaces in front of my <?php and the https://trianglecircleandsquare.com/xmlrpc.php also is correct. But i keep getting:
Your Jetpack has a glitch. Something went wrong that’s never supposed to happen. Guess you’re just lucky: xml_rpc-32700
Try connecting again.
Error Details: The Jetpack server could not communicate with your site’s XML-RPC URL. Please check to make sure https://trianglecircleandsquare.com/xmlrpc.php is working properly. It should show ‘XML?RPC server accepts POST requests only.’ on a line by itself when viewed in a browser and should not have any blank links or extra output anywhere.

So all help is welcome,
thanks in advance