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If you’re seeing an error related to domain names in AWS Certificate Manager (ACM), it’s likely because the default limit allows only 10 domain names per certificate. The good news is, you can request an increase to support up to 100 domain names on a single certificate.
To fix this, you need to request a quota increase through the Service Quotas console for ACM. Before you make the request, be aware that adding more domains means additional management, especially if you’re using email validation for those certificates.
It’s important to note that this quota applies only to certificates issued directly by ACM. If you import your own certificates, the limit doesn’t apply. When requesting a new certificate, you can include your primary domain name in the DomainName field and add extra domains in the SubjectAlternativeNames field.
Once AWS approves your quota increase, you’ll be able to include up to 100 domain names in just one certificate, making management simpler and more efficient.
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