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outlook 2016 client not accepting credentials

nigelbeatson asked
Last Modified: 2020-02-27
we have a single exchange server with clients running outlook 2016 locally.

everything has been working fine, but now we have one of users who is asked for credentials each time he runs outlook. when we enter the credentials name@domain.local with the correct password, this is not accepted.

if we cancel the windows security window we get the “need password” notice displayed in the bottom right task bar.

mail still seems to flow though??

we can connect using owa using the same credentials.

the option to prompt for credentials is not enabled.

if i try to add another profile the credentials are again refused.

as this does not affect anyone else, i suspect it may not be a server issue, but i am struggling to identify where the problem is.

can anyone help trap this problem?

many thanks
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