Heroku - how to reconnect Mailgun to my app - ruby-on-rails

Im working on a project with Ruby on Rails language, deployed to Heroku everything is working fine
I had Mailgun addon installed in my Heroku app
at one point I tried to change it to another mailing Addon
so I unlinked the Mailgun addon and connected another Addon
after a little research, I wanted to connect back the Mailgun addon.
when I tried to connect Mailgun again, it said that my app has an account and I cant reconnect it
I cant access my account by the email written in the Heroku's error notification.
what should I do at this point?
In that link below, there is an image of the error I get in my terminal.
Heroku Error for command: " heroku addons:create mailgun:starter"
Another link for an image of the error I get when trying to add Mailgun addon through my heroku app dashboard.
Heroku Error from Heroku dashboard
If you think I should use another mailer addon, I would love to hear about it.
Thank you in advance

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