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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(112.00000000000001, 72%, 20%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EF%3C/text%3E%3C/svg%3E)
Outlook for iOS and Android is unable to connect to Exchange 2019. After adding the account, an error during authentication is displayed, please try again later. The built-in mail app of the mobile phone can connect, send, and receive emails normally.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(230.39999999999998, 95%, 32%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EKG%3C/text%3E%3C/svg%3E)
Hi @Flash,
If an answer has been helpful, please consider accepting the answer to help increase visibility of this question for other members of the Microsoft Q&A community. If not, please let us know what is still needed in the comments so the question can be answered. Thank you for helping to improve Microsoft Q&A!
Thank you for posting your question in the Microsoft Q&A forum.
I noticed that you have also posted your question in the Chinese forum. After carefully reviewing the information you provided in the Chinese forum, the Outlook client, OWA and the mail that comes with your mobile phone are all working properly, which means that there is no problem with your Exchange settings, so it seems that the current problem is more closely related to Outlook for mobile. In order to solve the problem you are facing more efficiently and accurately, it is highly recommended that you post this question under the tag dedicated forum for Outlook for Mobile in order to get more targeted help and answers.
In addition, as I browsed the forums, I found that some other users are experiencing the same situation as you, and judging from these cases, the problem is most likely caused by an internal error in outlook for mobile. Please be patient and wait for the engineers to investigate and fix the problem, I believe they will solve the problem as soon as possible and restore the normal operation of the system.
If the answer is helpful, please click on “Accept answer” as it could help other members of the Microsoft Q&A community who have similar questions and are looking for solutions.
Thank you for your support and understanding.