how to remove smtp option from exchange cert

I was trying to fix a problem and created another problem. In exchange 2016, I selected the wmsvc cert, and checked SMTP, but now it's greyed out and I can't uncheck it.  How can I stop using SMTP with this cert?

smtp
DanNetwork EngineerAsked:
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Muhammad AsifSenior Solutions ArchitectCommented:
You may simply click on the certificate which you want to use ( certificate from public authority) and enable the SMTP service on it. I believe it will simply overwite the configurations and SMTP option from WMSVC would automatically uncheck.
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DanNetwork EngineerAuthor Commented:
I tried that, didn’t work.   I already have a cert that I am using, that is already using smtp, so I already tried that, didn’t work.
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Todd NelsonSystems EngineerCommented:
Make sure you familiarize yourself with the default certificates in Exchange before you go making changes that could cause issues.  Some won't allow changes either, and that is by design.

https://technet.microsoft.com/en-us/library/dd351044%28v=exchg.160%29.aspx
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DanNetwork EngineerAuthor Commented:
Thanks Todd, I was just making the change according to an Apple Tech's request, but I should have known better to allow an Apple tech to tell me what to do in windows...... grr.. so there's no way to fix it?
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Todd NelsonSystems EngineerCommented:
There is actually nothing to fix. It's default and cannot be changed.
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DanNetwork EngineerAuthor Commented:
thanks for the input guys.  Muhammad, thanks for the tip, that didn't work.
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DanNetwork EngineerAuthor Commented:
Thanks guys, Muhammad, that didn't work.
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DanNetwork EngineerAuthor Commented:
ok, so then when I first looked at the cert, I don't think smtp was checked, so I guess you're saying it won't hurt anything by leaving it the way it is?
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Todd NelsonSystems EngineerCommented:
Correct
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