Unintentional wildcard 301 Redirect?

[c_estep_tcbguy]

I have migrated a client's site to a new domain. I used Yoast tools to add 301 redirects for all active site pages from old domain to new domain in the .htacces files as neither the client nor I have access to hosting server via FTP (long story). Redirects are working as I intended, and we didn't lose too much in our rankings.

Unfortunately, as soon as I saved the .htaccess file in Yoast, old-domain.net/wp-admin began redirecting to new-domain.net/wp-admin. I can no longer login to the wordpress site on the old domain.

I did not enter a redirect for /wp-admin. Any thoughts on how this is happening or if there is some other way to get back in? Without server access, I'm pretty stumped.

Thanks!