Updates

Hello!
I purchased the PRO plan about a month ago and everything work perfect. Thank you very much! 🙂 Now I’ve uploaded the PRO pack to my second site and everything is fine, except for the updates. I can’t update the PRO plugin, and every time I try “Update failed: Update package not available.” appears. On the Rank Math pricing page is written “Unlimited personal websites” and I presume I should have the option for update and to my other site. I am logged into my account and everything is setup properly.
How can I update the Rank Math PRO plugin in my other site?
Thank you in advance!