Using S3 MRAP with presign url via CLI gets error for bucket name regex

We have 2 buckets:

projectassets-dev (us-east-1) projectsassets-dev-uk (eu-west-2)

We created a MRAP, added both buckets, enabled bidirectional replication, uploaded a picture of a cat. ie: cat.jpg

When we attempt to use the mrap via a presigned url, we get the following error:

aws s3 presign arn:aws:s3::1234567890:accesspoint/ourmrapalias.mrap/cat.jpg

Invalid bucket name "arn:aws:s3::1234567890:": Bucket name must match the regex "^[a-zA-Z0-9.-_]{1,255}$" or be an ARN matching the regex "^arn:(aws).:s3:[a-z-0-9]+:[0-9]{12}:accesspoint[/:][a-zA-Z0-9-]{1,63}$|^arn:(aws).:s3-outposts:[a-z-0-9]+:[0-9]{12}:outpost[/:][a-zA-Z0-9-]{1,63}[/:]accesspoint[/:][a-zA-Z0-9-]{1,63}$"

If I presign the bucket directly, it works fine. But it appears that MRAP doesnt like s3 buckets with dashes in their names? I created another bucket without them and it works fine, only problem is our application is already existing and I cant really just rename/move bucket names easily.

I've followed the documentation here for CLI presign url's.