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That's normal mine does it as well and so does my Note 10 plus and my wife's note 10 plus.. I dunno what version S10 plus you have but I have a unlocked At&t S10 plus and unlocked Note 10 plus also from At&t... they all click I'm pretty sure it's the dual aperture in cameras.. remember these cams in these phones from the S9 series to the S20 series including our S10 +s and Note 10 plus ect have some amazing powerful mobile camera tech.. plus the software ect and apps like the cam n Facebook snapchat Instagram ect normally all use the cam for selfies n pics ect and I'm pretty sure it's the phones logic board n software basically telling the cams to be ready incase you hit the cam button so it opens fast n is in focus for your pic.. and all usa S10e S10 n S10 + and all Note 10 n 10 + phones that are bought in the usa Canada China all use snapdragon 855 Soc chips and Korea n European have the exynos chips and both systems have that click lol
It may be normal when the camera is in use, but mine does it when i make a phone call. I honestly dont feel comfortable that my camera is randomly activated and potentially taking pictures without my knowledge.