Question about Garmin Vivofit 4

Unfortunately, this question is very difficult to answer. The manufacturer Garmin does not provide any information regarding the component composition of its products, but points out that international and EU directives (RoHs directives and EU Chemicals Regulation (REACH)) are complied with. Furthermore, the products are CE-certified.
The technical support staff member I had on the phone said that he does not believe that the Vivofit 4 wristbands contain nickel.
However, I have read reports on various devices in the Garmin forum that an allergic reaction occurred when wearing the wristbands.