While Portugal's system would know the FTer had entered and exited Schengen on the Brazilian passport in Portugal, the other Schengen countries generally wouldn't be able to readily recognize that the FTer had entered and exited the Schengen area via Portugal without looking at Schengen stamps; and its those other countries which may make an issue about the lack of a Schengen country exit stamp indicating timely departure from the Schengen zone.
Originally Posted by
oliver2002
The egates are connected to the SIS so a timestamp of your departure has been recorded. Munichi mmigration doesn't match each entry stamp in your passport. Instead they scan your passport and wait what the SIS has to say about you
Have you ever requested the SIS information that may be had on you to see what is there, how complete/incomplete it may be versus your expectations, and how accurate/inaccurate it is with what may or may not be there?
I'm pretty sure each Schengen country has something like this that can be used:
https://polisen.se/siteassets/blanke...tter-188-7.pdf
Entry/Exit System is not SIS, at least not at this point; and there is still stuff left to be done for EES. National entry/exit systems aren't all interconnected across the zone and eu-LISA's EES is not done.