API of on premis is not getting authenticated

I am using postman to deploy the package into on-premise orchestrator. The Orchestrator API is used for the same. V12.0
The code is working fine 2 days back and now it started giving an error as message": “You are not authenticated!”,

Following are the api used for Authenticating:

  1. https://uipath-orchestrator-tst.us.aegon.com/api/Account/Authenticate (POST)
    Get the response and make a Authorization: Bearer “response of API”
  2. https://uipath-orchestrator-tst.us.aegon.com/api/FoldersNavigation/GetAllFoldersForCurrentUser
    Add a header Authorization: Bearer “response of first API”

Response:
{

"message": "You are not authenticated!",

"errorCode": 0,

"result": null,

"targetUrl": null,

"success": false,

"error": {

    "code": 0,

    "message": "You are not authenticated!",

    "details": "You should be authenticated (sign in) in order to perform this operation.",

    "validationErrors": null

},

"unAuthorizedRequest": true,

"__abp": true

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