The error message "ClusterComputeResource' is not supported in NSX-T" typically indicates that there are Distributed Firewall (DFW) rules in your VMware environment that reference a compute cluster. NSX-T does not support using compute clusters in DFW rules as you would in a traditional vSphere environment. To mitigate this issue and make your DFW rules compatible with NSX-T, you should update these rules. Here's how you can proceed:

1. **Identify DFW Rules with Cluster References:**
- First, identify the specific DFW rules that reference the "ClusterComputeResource." These rules may have been created in your vSphere environment.

2. **Understand the Intent of Cluster Rules:**
- Understand the purpose of these rules. In traditional vSphere environments, it's common to use clusters for grouping VMs, but in NSX-T, segmentation and security are typically achieved differently.

3. **Update DFW Rules:**
- For each rule that references a cluster, you'll need to update it to work with NSX-T. The exact changes will depend on the intent of the rule. Here are some considerations:

a. **Replace Cluster References:** If the cluster was used to group VMs for security purposes, you'll need to replace the cluster reference with references to the specific VMs or security groups in NSX-T. This means redefining the source and destination objects of the rule.

b. **Redesign Rules:** If the rules were using cluster-based logic that's not directly translatable to NSX-T, you may need to redesign the rules to fit the NSX-T security model. This could involve creating new security groups, tags, or policies as needed.

c. **Review Policies:** Reevaluate the policies that these cluster-based rules were a part of. NSX-T has a different way of managing security policies, so you may need to create new policies to replace the old ones.

4. **Test and Validate:** Before making any changes in a production environment, thoroughly test the updated DFW rules in a test or staging environment. Ensure that the new rules achieve the desired security outcomes without any unintended consequences.

5. **Apply Changes:** Once you're confident that the updated rules are working correctly, apply them in your NSX-T environment.

6. **Documentation:** Document the changes you've made to the DFW rules for future reference and auditing.

7. **Review Other Configuration:** Review your overall NSX-T configuration to ensure it aligns with your security and segmentation requirements. Make sure that you have appropriate security groups, tags, and policies in place to manage security effectively.

8. **Seek Assistance if Needed:** If you encounter complexities or challenges during this process, consider seeking assistance from VMware support or consulting with a VMware NSX-T expert who can provide guidance specific to your environment.

Updating DFW rules from a vSphere-based model to an NSX-T model may require some significant changes, but it's essential to ensure that your security posture remains effective in the new environment while avoiding any compatibility issues.