can't copy files to bucket with rclone

Hello all,

I have the bucket setup and I can list/delete the files in the bucket with rclone.
However, when I tried to copy files, I encountered error.

ERROR : test.txt: Failed to copy: InvalidLocationConstraint: The specified location-constraint is not valid
status code: 400, request id: , host id:

rclone.conf:

[remote]
type = s3
provider = Linode
env_auth = false
access_key_id = [redacted]
secret_access_key = [redacted]
region = us-southeast-1
endpoint = us-southeast-1.linodeobjects.com
location_constraint = us-southeast-1
acl = private

note: ** sensitive data had been removed **