Rankmath account is not being connected with plugin

Hi,
I have installed Rankmath SEO plugin (free version) and have done all set up. I have registered my email ID with Rankmath account too by using email id s*****************@g******** . when I go into help section through rankmath dashboard, it says my rankmath account is not connected with plugin and when I click on “connect now”, I dont find any further process but it shows “page not found” on rankmath website. I have watched set-up related video but I am not getting “Ok, activate plugin” option as showing in the video.
Please help.
s*****************@g********
Website URL – https://souvenirspace.com

thank you.