@KumarRishii as you are working with the Customer Support ensure the platform access and setup related aspects are taken care of properly.
Here is few checklist to ensure setup readiness:
1) Permissions
- Make sure your Adobe AEP product profile (for the same sandbox) has at least:
- Sandboxes: Access to the target sandbox
- Schemas: View (and typically Edit if you’re creating)
- Datasets: View (helpful)
If you’re missing these, the picker can’t load anything and throws that error.
2) Org / Sandbox mismatch
- Verify your Tags (Data Collection) property is in the same IMS org you use for AEP.
- In the XDM Object modal, select the correct sandbox (must contain your schemas).
3) Schema availability
- Confirm there is at least one schema in that sandbox (ExperienceEvent preferred).
- If you just created field groups/schemas, refresh the Tags UI; sometimes it caches.
4) Extension & Datastream sanity
- Create/verify a Datastream (tied to the same org/sandbox). Not strictly required to list schemas, but aligning these avoids setup confusion.
if all these are met and you are genuinely having issues where Tags is unable to load the Schema, as you open the Data Element capture the .har file ensure to attach the .har file in your support request along with a screen recording for expediated resolution by the support.
Cheers!
