For starters, please don’t hijack someone else’s topic. Especially when the topic was solved months ago already. I split your post to a separate topic this time. Next time, it will be marked as off topic and deleted.
As for your question itself, I don’t fully understand the issue. Are you trying to change the email address of something? Which email address are you trying to change where exactly?
I haven’t heard of a problem like this. It is rare to me so all I can suggest is to backup any files if you need to by clicking Tools> Export. Now uninstall wordpress via Softaculous and then install it again.
It may be a corrupted installation but I may be wrong.
Did you configure WP Mail SMTP or another external email service/system? If so, then our servers are likely blocking the verification message.
We provide only an extremely limited PHP mail function with free hosting, meaning most messages you try to send from your site won’t work. But you can use an external SMTP server or other email service to send email from your site. The combination of a free Gmail account with the free WP Mail SMTP plugin is enough already.
By default, WordPress uses internal SMTP from hosting to send email (PHP mail() function).
But, internal SMTP feature is not available for free plan in this hosting.
So that’s why you didn’t receive the email from your site.