Amazon S3 expert for guidance on file upload error

Hi... We're trying to integrate an api in our wordpress site... One of the tasks require is to upload our files to a PRESIGNED AMAZON s3 url in the api owners S3 account. We are facing issues in uploading to presigned url and getting the following error Error executing "PutObject" on "[login to view URL]"; AWS HTTP error: Client error: `PUT [login to view URL]` resulted in a `403 Forbidden` response: <?xml version="1.0" encoding="UTF-8"?> <Error><Code>SignatureDoesNotMatch</Code><Message>The request signature we calcul (truncated...) SignatureDoesNotMatch (client): The request signature we calculated does not match the signature you provided. Check your key and signing method. - <?xml version="1.0" encoding="UTF-8"?> <Error><Code>SignatureDoesNotMatch</Code><Message>The request signature we calculated does not match the signature you provided. Check your key and signing method.</Message><AWSAccessKeyId>AKIA6KLT5FIQEJ2LSMJT</AWSAccessKeyId><StringToSign>AWS4-HMAC-SHA256 20220127T084418Z 20220127/us-east-1/s3/aws4_request 4812d8de6bd7ded336325dcb92d16297d482e8121a107bf48a09f919f9b82597</StringToSign><SignatureProvided>e4a29cd814f65ef29704b1a51ace611fadd21bda4c7dd91b6b885cd26223af85</SignatureProvided> Anyone having ideas on fixing it is most welcome..