Compare two files and get the matching rows based on two columns

Question

I have two pipe delimited file like below

file1.txt

A1234|JESSIE|OPTED
A1224|JOHN|OPTED
L1212|RAMSAY|OPTED
L1832|TIZEN|TESTED

file2.txt

A1234|B1465
G1211|L1211
G1241|L1212
G1271|L1232

Desired output

A1234|B1465
G1241|L1212

I am trying to compare column 1 and column 2 in file2.txt with column 1 in file1.txt and get the matching rows in file2.txt if it the first column in file1.txt matches with either column 1 or column 2 in file2.txt.

I tried the awk below but it doesn't appear to be giving me the right results.

awk -F'|' 'FNR==NR{a[$1]=1; next} a[$1,2]' file1.txt file2.txt > output.txt

Answer 1

$ awk -F '|' 'NR==FNR{a[$1]; next} ($1 in a) || ($2 in a)' file1.txt file2.txt
A1234|B1465
G1241|L1212