years ago, when I took certifications from SFA and AEA, they required a practical component. I am not sure where they stand on this now.
To become a Melt instructor, one has to have training by attending a course but MELT is not a certification.
None of my other certifications had practical parts.
It’s a difficult subject because adding in person tests adds significantly to the cost of any certification and can all but price some people out of the market.