I also still don't have mine. I only can suggest finding a specialist in real-life, a lawyer or finance specialist.

TIN (Tax identification number)  

If I understood correctly, in your country the personal income tax is deducted at source every three months and it is directly transferred to tax authorities by the employer (source  https://www.expat.com/en/guide/africa/egypt/14273-tax-in-egypt.html).    I would ask the nearest tax office to your place of residence, or your employer. Maybe the number is already on your pay check?

Another hopefully useful link:    Ministry of Finance www.mof.gov.eg

TIN can be anything, what you looking for is ITIN you need to fill out W-7 do not mistake it for W-7 COA. https://www.irs.gov/individuals/individual-taxpayer-identification-number

I am assuming you never done businesses in the USA so here is what you need to do:

- check off "Applying for a new ITIN" 

- check off "A" this means you are not a civilan for america and never done businesses with the country.

- At "Enter treaty country" you put Egypt and then at " treaty article number" you add the numbers "Article 8" (i am not 100% sure it is always hard to tell with limited infomation from peope, Article 8 is a businesses profit claim, you can still get tax in your own country by laws).

- Add your real name and address, Do note you need to file your address in "Foreign".

- Birth infomation

- Fill out 6a and 6b(if any)

- 6d you check what you think is needed to proof that it is really you. I would recommend Passport and driver licence, copy them in a printer and keep them save until the next steps.

- 6e check "No"

- Sign here is just your name, the days you signed and phone number. DO not do anything else you are done with the paper.

Make a copy of the W-7 for safty reasons. Then you give it to someone who is  IRS-authorized Certifying Acceptance Agent. or by mail at:

Internal Revenue Service
Austin Service Center
ITIN Operation
P.O. Box 149342
Austin, TX 78714-9342

They both require the copy passport and driver licence, do not forget to add those copys in the mail if doing it by mail.

Wait a few weeks and you should get it. Enter the ITIN numbers the tax interview requested and everything else should be easy.