Canon has omitted the center pin from the EOS Rebel SL3 and EOS 2000D, a decision which renders both DLSRs incompatible with almost all third-party flash accessories. Naturally, the company has not pointed this out for either device.
https://www.notebookcheck.net/Sly-tactics-Canon-has-limited-the-EOS-Rebel-SL3-EOS-250D-EOS-Kiss-X-and-EOS-2000D-Rebel-T7-to-proprietary-flash-accessories.420194.0.html