I have this same error (Your site is experiencing technical issues), and now the activation link won’t even work and it’s coming up with a new ‘debugging’ error.
"There has been a critical error on your website. Please check your site admin email inbox for instructions.
Learn more about debugging in WordPress."
Please contact me and let me know how I can fix my site ASAP - I need it up as I have a client wishing to view it to purchase!!