Is e-voting currently used in any elections with EMB participation?

Nigeria, Electoral Act 2010 (last amended in 2015), accessed 3 February 2019

52. (1) Voting at an election under this Act shall be by open secret ballot.

(2) Voting at an election under this Act shall be in accordance with the procedure determined by the Independent National Electoral Commission.

Library of Congress, Nigeria: President Vetoes Electoral Act (Amendment) Bill, accessed 7 February 2019

The 2015 amendment to the Electoral Act amended the Clause 52(2) prohibiting the use of e-voting and gave the power for INEC to determine the procedure of voting. Then, with the further amendment proposal (Electoral Act (Amendment) Bill 2018), INEC sought to further amend the provision to implement electronic voting. However, on March 13, 2018, Nigerian President Muhammadu Buhari, citing a number of concerns, vetoed  the Electoral Act (Amendment) Bill 2018.