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Hi,
First make sure you have permission to purchase reserved instances.
After that, this is what I have found regarding the issue you are having:
`Resolution Here are some common reasons why you might not see the RIs that you're looking for:
-
AWS can't guarantee the capacity that you're looking for. Purchase capacity in a different Availability Zone in the same Region instead. Also, be sure that the RI that you're trying to purchase is for an instance configuration that AWS offers.
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You've reached your limit for RIs in a Region. For information about viewing and increasing your RI limit, see Amazon EC2 service quotas.
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You're purchasing a No Upfront RI with a new AWS account. AWS restricts the ability for new accounts to purchase No Upfront RIs. The restriction on purchasing No Upfront RIs is lifted automatically, usually after about a month. For more information, see Reserved Instances payment options.
AWS Support can't manually update these limits or add No Upfront RIs to your account on your behalf.
Note: AWS Support can't purchase RIs on your behalf.`
https://repost.aws/knowledge-center/ec2-ri-buy-error
Let me know if this helps.
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Are Reserved Instances the same with Dedicated Host Reservations?
Dedicated hosts are different.You must have active Dedicated Hosts in your account before you can purchase reservations. I would check that first.
Here is a link with more information: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/dedicated-hosts-overview.html