Since 1.1.2021 Ministry of internal is not authorizing copies of the Czech residence applicants’ documents. If you are applying for Czech residence or an extension of the Czech visa with your rental contract, you should arrange legal copies of your rental contract before your appointment time. Legal copies can be obtained at the Czech post office or any notary offices.
Signature authorization is needed for signing specific documents and Power of attorney. With your signature authorization, you confirm your identity.
For arranging signature authorization you don’t need to visit notary offices. The Czech post office has notary services called CZECH POINT. Authorization of the signature of one document cost 33 kč. You can arrange it at any post office and you should bring your passport and residency permit. The Czech post office has an appointment system and it is in English.
Here you can book your appointment for Czech Point service before you go to the post office: https://www.postaonline.cz/en/rezervace
After they call your number you should say at the window – Potřebuji úředně ověřit podpis.