ACM Certificate validation fails

I am trying to connect Cloudflare with my Lightsail distribution.

For that I need to create certificate using AWS ACM. I am creating it for uttertechnology.com.

So AWS provide CNAME name value (random_no.uttertechnology.com) , ( `*.acm-validations.aws.)

I have configured record as CNAME record with DNS in cloudflare.

But I get following error
Status:

Request failed!

We could not complete this certificate request because one or more domains in the request are invalid.

I have checked dig command

$ dig +short _03faefc79e85d87c151f9bbf14739974.uttertechnology.com
_95b007485f1b5f49abf513c5d123a292.jddtvkljgg.acm-validations.aws.

Not sure what is the problem does period at the end of Name should be present Cloudflare CNAME trims it.

CNAME are not proxied and set as DNS

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