Reset Authentication method to Exchange 2013 EAC and now I can't get in.

In trying to work through a list of issues related to Exchange upgrade I inadvertently have locked myself out of the EAC by changing the authentication method.  Is there any way to change it back?

Hi,
According to my experience, the ECP login failure issue has many reasons. Thus, to narrow down the cause, we can try to confirm the following information and try the following troubleshooting:
1. Check the detail information about OWA and ECP virtual directory:
Get-owavirtualdirectory |fl
Get-ecpvirtualdirectory |fl
2. Clear or restart the MSExchangeOWAAppPool
Thanks,
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Angela Shi
TechNet Community Support

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