I'm a U.S. software developer looking to re-locate to Berlin. I will be seeking a limited residence permit (Aufenthaltserlaubnis) which requires a local registration (Meldeschein.)
I understand that one must apply for the Meldeschein within 14 days of arrival in Berlin (this period varies by locality,) and to do so one must provide proof of German residence in addition to one's passport.
Articles which discuss this process frequently define such "proof of residence" as a lease or a rental contract. I've found one in particular which expands on this criteria: "Rental agreement, lease, or confirmation letter."
With the understanding that flat-shares often involve less formality than rents and sub-letting, my question is: can I reasonably expect to apply for the Meldeschein as a resident of a Wohngenmeinschaft flat-share?
Am I likely to find a WG which will include me in their rental agreement / contract / lease? Is there any difference between these, or do they just mean lease / lease / lease?