Unable to add AWS Route 53 domains with DKIM keys: CharacterStringTooLong (Value is too long)

Symptoms

When trying to add a domain to AWS Route 53,  the following error appears:

PLESK_INFO: ' CharacterStringTooLong (Value is too long)

DKIM keys with a bit length of 2048 are enabled for the domain.

When performing 'dig' command, TXT-record is not concatenated, it gets broken into two parts:

# dig @ 203.0.113.2 TXT example1.com
...
;; ANSWER SECTION:
example1.com.          86400  IN      TXT    "v=spf1 +a +mx +a:user.centos6 -all"
example1.com.          86400  IN      TXT    "v=DKIM1\; k=rsa\; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAraC3pqvqTkAfXhUn7Kn3JUNMwDkZ65ftwXH58anno/bElnTDAd/idk8kWpslrQIMsvVKAe+mvmBEnpXzJL+0LgTNVTQctUujyilWvcONRd/z37I34y6WUIbFn4ytkzkdoVmeTt32f5LxegfYP4P/w7QGN1mOcnE2Qd5SKIZv3Ia1p9d6uCaVGI8brE/7zM5cz" "MthVPE2WZKA28+QomQDH7ludLGhXGxpc7kZZCoB5lQiP0o07Ful33fcED73BS9Bt1SNhnrs5v7oq1pIab0LEtHsFHAZmGJDjybPA7OWWaV3L814r/JfU2NK1eNu9xYJwA8YerWosL45CSkyp4QeQIDAQAB"

Cause

Route 53 extension bug with ID #EXTPLESK-286 that is going to be fixed in future updates.

Resolution

As a workaround, put additional double quotes in the beginning and ending of the record:

1. Go to Plesk > Domains > example.com > DNS Settings

2. Make sure that there is the DKIM policy record like (add it in case it is absent):

CONFIG_TEXT: _domainkey.example.com. IN TXT o=-;

3. Set Google selector record:

CONFIG_TEXT: google._domainkey.example.com IN TXT ""v=DKIM1\; k=rsa\; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAraC3pqvqTkAfXhUn7Kn3JUNMwDkZ65ftwXH58anno/bElnTDAd/idk8kWpslrQIMsvVKAe+mvmBEnpXzJL+0LgTNVTQctUujyilWvcONRd/z37I34y6WUIbFn4ytkzkdoVmeTt32f5LxegfYP4P/w7QGN1mOcnE2Qd5SKIZv3Ia1p9d6uCaVGI8brE/7zM5cz" "MthVPE2WZKA28+QomQDH7ludLGhXGxpc7kZZCoB5lQiP0o07Ful33fcED73BS9Bt1SNhnrs5v7oq1pIab0LEtHsFHAZmGJDjybPA7OWWaV3L814r/JfU2NK1eNu9xYJwA8YW7WosL45CSkyp4QeQIDAQAB""