Help in CONCAT()

I used the following to concatenate two integers:
β†’ concat(${interview_code},${id})

I am able to see that it is working on the webform however, it is not working while testing on kobocollect. Please help

Did you check your form with the online validator?
You may add concat(string(…), string(…)).
See ODK XForms Specification.
For joining numbers you can often use multiplication plus addition. E.g. 1000*${sectionNumber} + ${householdNumber} if the household number is 1 to 999.

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@apulikkal, here is also a good example of concat that has already been discussed in the community forum previously: