Amazon Prime Video

On quality settings choose quality to best quality

If not then you dont have a subscription for 4k or 1080p

I have faced similar problem in my s23..I just restarted my device ,it worked for me.
Give it a try

For Amazon Prime, internet speed matters. If internet speed is slow, it will not play HD quality.

Dear Samsung Member,

Greetings from Samsung Customer Support!

As per your query, we request you kindly share the log file. Also, share video clips and images for better understanding. This will help us to investigate further and resolve this issue.

Samsung Members Application (Open Samsung Members Application > Support> Tap on send feedback> Choose Composer> Select error report> select the appropriate issue category> Type your query and send.)

Note: To ensure relevant log information is included in the error report, submit the report within 3 minutes of encountering the bug or error, and do not terminate (swipe away) the Samsung Members application until you are notified that the report has been sent. This can take up to 5 minutes.

Warm Regards,
Samsung Customer Support

Looks like same issue with every S23 ultra. Any solution?