Yesterday I was facing an error while generating the Access Token

Error:

Today I am able to generate access token but not able to access our API

{
"Exception": "API Gateway encountered an error. Error Message:  Unauthorized application request. Request Details: Service - A_OAUTH2_YacthDetailsAPI, Operation - /getYacht, Invocation Time:11:05:15 AM, Date:Aug 14, 2023,  Client IP - 192.168.10.200, User - Administrator and Application:sys:defaultApplication"
}

https://higherlogicdownload.s3.amazonaws.com/IMWUC/webMethods/Files3/c9208b0f75423dcbfda5af0921f1f2d80024b159_2_1035x603.png 1.5x, https://higherlogicdownload.s3.amazonaws.com/IMWUC/webMethods/Files/c9208b0f75423dcbfda5af0921f1f2d80024b159.png 2x" data-dominant-color="C4C4C4">

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Please see the screen shot of the below error:

https://higherlogicdownload.s3.amazonaws.com/IMWUC/webMethods/Files3/cd446c2353ca1fc6813e66860f794e9d20905c86_2_1035x568.png 1.5x, https://higherlogicdownload.s3.amazonaws.com/IMWUC/webMethods/Files/cd446c2353ca1fc6813e66860f794e9d20905c86.png 2x" data-dominant-color="FCFAFA">

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This is completed .

https://higherlogicdownload.s3.amazonaws.com/IMWUC/webMethods/Files3/2decd46bcf88c1a690007f55945684218d4e0f3b_2_1033x636.png 1.5x, https://higherlogicdownload.s3.amazonaws.com/IMWUC/webMethods/Files/2decd46bcf88c1a690007f55945684218d4e0f3b.png 2x" data-dominant-color="FDFDFD">

image1283×789 46.6 KB