I have the same trouble.
For a new shop; it’s impossible to connect using the IOS App. It says that i need to install and connect Jetpack but the Jetpack is intalled and it is connected.
I’s been 3 days , i keep disconnect and reconnect while trying all sorts of things.
– make sure i have the latest WP version, the lastest WooCommmerce, the latest jetpack plugins
– make sure i am on PHP 7.4
– make sure my xmlrpc.php page is giving the right message
– try while using another theme (in case the theme was causing trouble)
– try while disabling all other plugins (Except Woo and Jetpack)
– try on another brand new WP installation
– get in touch with Jetpack support team and try what they suggest (4 or 5 emails exchange)
After all this and some other things tested, my situation is the same :
When i connect Jetpack in WP, it’s Ok , i see that the website is connected but the accounts says “undefined” (where we should normally see the email of the account connected)
I if i check the WordPress.com account, i see that the website is connected that the IOS app is connected.
If i do a https://jptools.wordpress.com/debug/ , it tells me that “everything looks great”
I have connected other shops before with no trouble.
If you help find fix this non sense bug, i think i’ll be grateful for a thousand years!