You got access the the LH lounge in MUC with VA status when flying, not SQ but LH?? Now thats a first!
It was strictly speaking a SQ-codeshare operated by Lufthansa.
Have previously got into the same lounge (pull your own Bavarian beer) when flying Etihad using VFF Gold status.
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There seems to be a 'twilight' zone with Lufthansa and Gold VFF access even when flying a non-VA badged flight. If you don't have the actual card on you then you get access declined (happened in 2016 when clearing out cards before flying and took out VFF card in error). They argued that unless they have magnetic stripe/chip for their reader then they cannot access the required system. May have been true or just a clever excuse.
That's the only time from 2010 to 2023 (ex-Covid absences) that we've not gained access. Many times without any issues at all as the staff member seemed to know exactly what options to select to get to the right place, it seems that for VFF cards they have to select a secondary menu option before they swipe.
For the initial check-in using Lufthansa Business check-in, having presented the printed our e-ticket T&Cs saw the agent select a couple of menu options on her terminal and correct her initial statement about the baggage allowance. The (updated) e-ticket which had changed our originally booked MUC SIN flight from an SQ operated to a LH operated flight - still showed the exact same baggage allowance as for the originally booked itinerary @ 25kg. She also said that we'd have received the additional allowance but we did not need it.
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There was one more lengthy 'issue' though, which saw me left on my own as my better half headed into the lounge. Still we had many hours before the flight boarding began (we always leave some extra hours for early arrival in case there is snow disruption between Austria & Munich Airport).
Online Checkin started 48hrs (24?) prior to flight time, so I dutifully stayed up to checkin & get our seat allocation (expecting the worst). Pleasantly surprised to find we had been allocated near dream seats (for us). However, Lufthansa have not updated their system for Covid entry requirements for Australia. That meant I could not complete the checkin as I had no 'acredited test result' to upload. Tried contacting Lufthansa 'Help' online - nothing doing. Sent off an email & to this day still no reply.
Got to airport & at the checkin, to my/our horror our seats had been changed from window & adjacent to Centre aisle & middle. Check-in agent said there was a empty window & adjacent empty but she couldn't access it - try at the lounge.
At the lounge after being admitted, I went over to the internal desk. Following a friendly discussion about the flaws/problems with their online checkin AND nothing saying that allocated seats can be forfeited if checkin not completed - a call to somebody got the seats released to us.