Its working for me:
CONCATENATE(โhttps://api.whatsapp.com/send?phone=",CONCATENATE("+91โ,[Faculty Number]),"&text=",CONCATENATE("Namaste ",[Name]โฆ)
โ> replace +91 by your countrycode, here Faculty Number is my column where 10 digit mobile number(except country code) is stored. And the concate the predefined message with dynamic values.
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