myibidder keeps responding back with a "Wrong UserID or Password"
* User ID and Password is exactly the same as I use on eBay, tried logging in multiple times now on eBay and there's no doubt I use the exact same userID and Password.

* Tried myibidder on multiple browsers, including the Android App. No luck, same error everywhere.

Any ideas?

Seems like eBay put a temporary block on your account due to login from another location.
eBay usually remove it after 48 hours or so. Please wait and try again.
If you don't want to wait, you can try to create another eBay account for sniping purposes.