Unable to configure with AWS Route 53

Attempting to configure icloud custom email domain with a domain I have on AWS Route 53.

After navigating to the hosted zone for my domain [mydomain.com]

I am able to succesfully add a MX Record with the value:

10 mx01.mail.icloud.com

10 mx02.mail.icloud.com

Then I attempt to add the needed TXT records.

Route53 does not allow me to add multiple txt records for the root domain [mydomain.com]

So I combined the txt records into 1.

VALUE:

"apple-domain=[redacted]"

"v=[redacted]"

"redirect=[redacted]"

But I am still left with a problem.

There is no way for me to add a cname for host sig1._domainkey because I can only add cnames to my hosted zone, so it needs to be of the format sig1._domainkey.mydomain.com

Is this okay?

If I try all the steps above, and try to validate with the Finish Your Setup button I get an error saying:

"Check your SPF record"

Please advise.

Thanks