Problem description
The value of the AccessKeyId field of the x-oss-credential header in the PostObject request is invalid.
Causes
You initiated a PostObject request that uses the V4 signature, but the value of the AccessKeyId field of the x-oss-credential header in the PostObject request is invalid.
Examples
The AccessKeyId field of the x-oss-credential header in the PostObject request contains invalid characters, such as \t.
Solutions
Make sure that a valid value is specified for the AccessKeyId field of the x-oss-credential header.
For more information, see PostObject.