Air carrier Captain reported a misunderstanding about the 5G aircraft documentation needed to execute an approach. This had an effect on this day's flight; leading to a divert to an alternate airport.

Narrative

We conducted a Missed Approach on the RNAV (GPS) Runway XX Approach due to weather. We were additionally concerned about not being in compliance with 5G Restrictions as a result of not reaching visual conditions by the Final Approach Point. We were unable to fly the ILS Runway XY Approach (which most likely would have remedied the whole situation); and this was due to having STALL PROT speeds and because of the wind conditions. After executing the Missed Approach procedure; we then coordinated with ATC to attempt another RNAV Runway XX Approach. The weather deteriorated to worse conditions than before during our second approach; so we executed another Missed Approach procedure. After our second Missed Approach procedure; our fuel amount was close to our bingo fuel amount and it was necessary to divert to our Alternate Airport; which was ZZZ1. We coordinated with Dispatch and diverted to ZZZ1.After we arrived in ZZZ1 and after speaking with our Dispatcher; I spoke with a Flight Ops Duty Officer to help determine whether or not we could legally attempt a flight back to ZZZ and do so in full compliance with our Flight and Aircraft Manuals; Crew Notices; as well as NOTAMs; given the conditions along with the 5G considerations. The weather was forecast to improve at ZZZ; and we concluded that we legally would be able to return and attempt another landing at ZZZ given all aforementioned considerations. We coordinated with Dispatch and Operations and got nearly fully ready to go; but we then discovered that were over-fueled by approximately 3200 lbs of fuel. We had to remove baggage from our aircraft in order to meet our weight restrictions.We were additionally unable to use our EFB App in order to obtain our release as appropriate revisions digitally after we arrived in ZZZ1. This occurred once again after we arrived in ZZZ (I'm guessing this was likely due to the flight numbers being the same as our first flight leg); so we had to coordinate with Operations on receiving paper copies of our release and revisions; and this may have caused for some additional undue delays. After we executed our first Missed Approach procedure; we were told to fly the Published Missed Approach and got assigned 4000 ft; so we confirmed our instructions with Departure; and got assigned a Hold over ZZZZZ [Intersection]; which we quickly arrived at. I then mistakenly forgot to call our Holding Pattern Entry and Exit times to ATC; and this was likely due to being task saturated from finishing up with our Missed Approach Procedure; Checklists; trying to set up the assigned holding pattern into our FMS; while also communicating with our Flight Attendants; Passengers; and Dispatch.My FO (First Officer) and I both thought that we were familiar with the information presented in Crew Notice XX-XXX as well as 5G considerations in general. That said; we were each individually under the impression that RNAV Approaches were prohibited without an AMOC (Alternative Method of Compliance) (and that Only ILS and Visual Approaches were permissible at 5G-Affected Airports with no AMOC.) Upon further inspection of Crew Notice XX-XXX however; we found more information regarding RNAV Approaches (hidden within the RNP AR paragraph--easy for one to overlook in my opinion); essentially stating that restrictions on RNAV Approaches are NOTAM dependent. Even upon discovering that info however; we were still left questioning in the back of our minds whether or not the RNAV Approach was indeed legal given the 5G/AMOC considerations in concordance with the NOTAMs of our destination. This is ultimately what caused me to ask for the additional opinion of a Flight Ops Duty Officer; as in the moment of it all the information all seemed somewhat convoluted to both of us. We feel as though we did the right thing by making the conservative decision of not flying a legally questionable approach; however it would have been nice to have the information more clear and readily available as that may have potentially prevented any and all confusion in this situation.