Cannot add email alias to any email account

Cannot add email alias to any email account

Hello, 
For some reason, we are having issues adding email aliases to any of our Zoho Mail email accounts. When we try to add an alias, we get an error message that says "Unable to add Alias Address". Any help would be appreciated!
Also, for some reason, Zoho has added some aliases to our email accounts. They are:

1450413734938@zoho.com
1450413736800@zoho.com
1450413737172@zoho.com
1450413738751@zoho.com

If we could please have all of those removed, we'd really appreciate it. Thanks!

May God bless!

Noble Obodum
President & Founder
AdventistsConnect
noble@adventistsconnect.gq