I would omit 'professional' as it's already understood.

Registered Pharmacy Technician- Licensing, Renewals ...https://floridaspharmacy.gov › licensing › registered-ph...
To obtain a Registered Pharmacy Technician license in Florida, an individual must meet the following requirements pursuant to Section 465.014, Florida Statutes:.

licenses-technician | Arizona State Board of Pharmacyhttps://pharmacy.az.gov › licenses › technician-trainee
Technician License Information If you have any questions about technician trainee licensing, please email Andrea Martinez, Licensing Administrator.
Technician (Trainee): $60.00
Duplicate - license, permit or certificate: $10.00
Technician (PTCB or ExCPT): $82.00

Apply for a Pharmacy Technician License | Mass.govhttps://www.mass.gov › how-to › apply-for-a-pharmac...
Apply for a pharmacist technician license using the Professional Credential Services (PCS) web portal. This is not the application for pharmacists or ...

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Note added at 1 day 12 hrs (2021-12-03 03:35:18 GMT)
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I supposed another option might be 'certified technician,' since they're presumably certified by a licensing body.

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Note added at 7 days (2021-12-09 02:05:24 GMT) Post-grading
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Erratum: "I suppose ... " :-)

It's worth pointing that, in the target text, making an explicit reference to a number, whether a license or a registration number, may not be necessary, as numbers appearing directly after the words would look perfectly natural; that said, using a number symbol (#) would work, too.

Technician License / Technician License #