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I thought it might be due to the fact that the domain name contains the underscore "_".
From the following documentation, it appears that underbars are not allowed in Lightsail's DNS host zone.
https://lightsail.aws.amazon.com/ls/docs/en_us/articles/amazon-lightsail-domain-name-format
For DNS zones and records, the domain name must have 1-255 characters. Valid characters for domain names include (a-z), (A-Z), (0-9), hyphens (-), and periods (.). You can’t use spaces.
I think it may be as simple as the field wanting only the record name aweber_key_a and is erroring when you add the .domain..... Try shortening to just the record and not the FQDN.
Hello,
We appreciate that that you brought up this issue. You should now be able to create these CNAME records in your DNS zone’s advanced tab.
Thank you for using Lightsail, Leslie
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Oh damn, this seems to be the case. I assume there is no workaround for this :(. Thanks a lot for your help.
I am not familiar with AWeber, but I think it would be best to contact AWeber support to see if there is a workaround for not being able to use the underbar.
Just had a chat with them, and they will add this a as feature request. Most probably I'll need to switch services :)