We ended up finding out the issue. The problem was caused by Chinese Characters in the Log-in Banner. When we removed some special characters the issue went away and users where now able to log into AnyConnect on their Windows devices. Thank you to those that responded. We did test DNS but that didn't resolve the issue, somewhat shocking, because it normally is DNS. I also didn't feel comfortable posting certain logs as they would show critical information. I could have blurred information but knowing my luck it would have been information necessary to troubleshoot. Thanks again everyone!
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