Bulk sign is failing multiple times

Hi, We are facing continuous issues while doing the bulk sign process, below are the error messages it is throwing to us Error 1 : Silanis.ESL.SDK.EslServerException: Could not create a signer authentication token. Exception: The remote server returned an error: (500) Internal Server Error. HTTP POST on URI https://apps.esignlive.com/api/authenticationTokens/signer/multiUse. Optional details: {"messageKey":"error.internal.default","technical":"No signer found with uid or email FIManager","code":500,"message":"Unexpected error. We apologize for any inconvenience this may have caused you, please try again. If the problem persists, please contact our support team.","name":"Unhandled Server Error"} ---> Silanis.ESL.SDK.EslServerException: The remote server returned an error: (500) Internal Server Error. HTTP POST on URI https://apps.esignlive.com/api/authenticationTokens/signer/multiUse. Optional details: {"messageKey":"error.internal.default","technical":"No signer found with uid or email FIManager","code":500,"message":"Unexpected error. We apologize for any inconvenience this may have caused you, please try again. If the problem persists, please contact our support team.","name":"Unhandled Server Error"} ---> System.Net.WebException: The remote server returned an error: (500) Internal Server Error.

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Error 2 : Silanis.ESL.SDK.EslServerException: Could not create a signer authentication token. Exception: The remote server returned an error: (400) Bad Request. HTTP POST on URI https://apps.esignlive.com/api/authenticationTokens/signer/multiUse. Optional details: {"messageKey":"error.validation.packageManagement.invalidState","message":"This package is in an invalid state for requested action.","code":400,"name":"Validation Error"} ---> Silanis.ESL.SDK.EslServerException: The remote server returned an error: (400) Bad Request. HTTP POST on URI https://apps.esignlive.com/api/authenticationTokens/signer/multiUse. Optional details: {"messageKey":"error.validation.packageManagement.invalidState","message":"This package is in an invalid state for requested action.","code":400,"name":"Validation Error"} ---> System.Net.WebException: The remote server returned an error: (400) Bad Request.

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Error 3 : System.Net.Http.HttpRequestException: Response status code does not indicate success: 403 (Forbidden).

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Please let me know if you require any other details.