@Russ_Thomas I found a solution, see below.
//get the activation code
WebUI.waitForElementVisible(findTestObject(activationCode),50)
WebUI.doubleClick(findTestObject(activationCode))
WebUI.sendKeys(findTestObject(activationCode), Keys.chord(Keys.CONTROL, ‘c’))
WebUI.click(findTestObject(inputActivationCode))
WebUI.sendKeys(findTestObject(inputActivationCode), Keys.chord(Keys.CONTROL, ‘v’))