Can't receive emojis

When receiving SMS, emojis are not displayed. Instead, I get weird combinations of letters (e.g. the thumb up is displayed as three question marks). However, I can send the very same emoji without problems, and it is displayed correctly in my messenger. I tried Pulse instead of Message - same problem. I use Open Launcher, but I didn’t find any settings there related to emojis. Any suggestions how the problem could be solved?

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