What is the process for NRI enrolment?

NRI seeking enrolment need to visit an Aadhar enrolment centre and submit a request in requisite enrolment form alongwith valid supporting documents. Enrolment and Update form can also be downloaded from https://uidai.gov.in/en/my-aadhaar/downloads/enrolment-and-update-forms.html
The enrolment operator shall capture the following informations during the course of enrolment:

Mandatory Demographic information (Name, Date of Birth, Gender, Address and email)
Optional demographic information (mobile number)
And
Biometric Information (Photo, 10 finger prints, both Iris)
Type of documents presented [valid Indian passport is mandatory as Proof of Identity (PoI)]
Residential Status ( Resided in India for at least 182 days is not applicable for NRI)
In case the NRI requires an address other than that mentioned in passport, he has option to submit any valid proof of address document available to resident Indian.

After completing the enrolment the operator shall return all the documents alongwith an achnowledgement slip containing the applicable charges.
List of valid supporting documents is available at List of Supporting Document
You can locate the nearest enrolment centre at : Bhuvan Aadhaar Portal