I'm having trouble getting my new remote to communicate with my Toshiba

DVD-VCR player.
I tried all the remote control codes listed on the instructions of the
new remote without success.
How do I find the right remote control code?
(My original toshiba remote is an SE-R0086 remote control.)

There shouldn't be any issue of finding the right code with the Toshiba
remote for the Toshiba device. If it is a universal, call the phone
number in the sheet that came with it to ask them for the code.