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Hi , 

Managed to resolve by trying to complete the badge- turns out Einstein Setup had toggled back to off despite turning it on previously and my playground hadn't connected to the badge properly- now all sorted, leaving this up in case anyone else has the same issue!  

Hi John, 

Per Salesforce's own documentation on Predefined Field Values for Quick Actions: "A predefined field value for a lookup field must be a reference to a record Id field or another lookup field." The predefined-value formula editor on a Quick Action only accepts Id/lookup-type field references for lookup fields, it doesn't expose Custom Metadata Type fields as valid merge field options in that specific context, even though CMDT works fine in regular formula fields elsewhere in the org. That's exactly why you got "does not exist," the formula editor there simply doesn't recognize CMDT as a valid source for a lookup predefined value, regardless of your CMDT being perfectly valid. 

Official reference:

Given this limitation, and since you're already moving toward the Visual Picker + Screen Flow approach for your switchboard, it's worth solving the "default Primary Campaign Source from CMDT" problem inside a Screen Flow's Create Records element instead of a Quick Action: 

1. In your Screen Flow, add a Get Records element to query your Custom Metadata Type record. 

2. Use an Assignment or directly reference the CMDT field in your Create Records element for the Opportunity, Flow's Create Records doesn't have the same restriction, you can reference any accessible field, including CMDT values, when building the record to insert. 

This sidesteps the Quick Action limitation entirely and keeps everything native, no Aura/LWC workaround needed for this particular piece. Combined with the Visual Picker switchboard, this gives you a fully declarative solution for both original problems.

@Azfer Pervaiz here you go:

Try below solutions:

1. Disable any VPN if ON.
2. Clear browser cache
3. Use the most recent cli version
4. Make sure vs code open the expected url

https://developer.salesforce.com/docs/atlas.en-us.sfdx_dev.meta/sfdx_dev/sfdx_dev_troubleshoot_auth_errors.htm

Hi Pablo, 

You can try below approach that consistently works for the Admin cert: 

1. Start with the official Salesforce Exam Guide, not a course or video series. It's the actual blueprint, breaks down every exam section with its weightage (e.g. Configuration & Setup, Security & Access, Standard/Custom Objects, Sales & Marketing Applications, Service & Support Applications, Activity Management, Data & Analytics Management, Workflow/Process Automation). Study time should roughly mirror those weightings, not be spread evenly. 

   Official Trailhead cert prep trail (mirrors the exam guide section by section):

2. Hands-on Trailhead Playground practice beats passive reading for this exam specifically, since most questions are scenario-based ("what would you configure to achieve X"), not definition-recall. For every module you complete, immediately redo the same task from memory in a fresh Playground without the guide open. 

3. Use Trailhead's own interactive scenario/flashcard trail alongside the modules, it's built specifically for this exam and reinforces recall through spaced repetition rather than just re-reading: 

(same trail includes these interactive study tools) 

4. Join the Trailblazer Community and look for/join a Study Group, Salesforce runs official Admin Study Group sessions periodically that walk through each exam section live, this is Salesforce-endorsed prep, not third-party. 

5. Pomodoro (25-30 min focused blocks) works well specifically because Setup pages and declarative tools have a lot of small, easy-to-conflate settings (e.g. sharing rules vs manual sharing vs role hierarchy), short focused sessions per topic reduce mixing concepts up. 

6. Time commitment: Salesforce recommends 6-12 months of hands-on admin experience before attempting this exam, if you're studying alongside real job exposure, 5-8 focused hours/week is a realistic sustainable pace without burning out; if studying without daily hands-on org access, lean toward more Playground time relative to reading time to compensate. 

7. Don't skip the Certification Program Agreement and exam policies page before exam day, format/logistics questions catch people off guard on exam day itself, not just content:

Good luck, this is a very achievable cert with consistent Playground practice.