Before integrating with the new upgrade of Netsuite, You should always ensure that your NetSuite accounts and related integrations are not bound to a specific data center. As of NetSuite 2020.2, data center-specific domains for integrations are not supported. So we have to remove the data center-specific domains from the account.
Traffic health checkups will ensure that incoming traffic is compliant with the requirement that your account, when necessary, can be moved to a different data center. Compliance with this requirement ensures that your account can be moved without affecting the operation of your integrations or blocking incoming traffic.
You can generate a Traffic Health report to help you identify traffic in your account that is using data center-specific domains.
Setup > company> traffic health
generate report.
After some time the report will be generated. If there is no URL added there the account is capable of a new upgrade.
For more details Suite answer ID-98661