I'm hosting by blog carriagereturn.nl on Amplify and there are differences to your R53 and rewrite config; I have permanent redirect (301) as the first rule.
www.my.tld https://my.tld 301 /<*> /index.html 404
And Route53 for www -address is CNAME to applifyapp, not cloudfront.
www.my.tld CNAME *.abcdefg99.amplifyapp.com
I hope this helps you in getting www->apex rewriting to work.
Redirect domain old to new domain automaticallyasked 3 months ago
Domain not working without "WWW"asked 9 months ago
https:// to https://www does not workasked a year ago
www redirect in amplify console infinitely redirectsasked 3 years ago
Can't activate root domain for my amplify appasked 2 years ago
S3 Website Redirectasked 8 months ago
Amplify redirect www to apexasked 10 months ago
Redirect Domain To LinkedIn Profile Pageasked 3 months ago
"www" address of websiteasked 3 years ago
WWW and Non-WWW is clashing in Wordpress. Help!asked 4 years ago