Open the specified tab on the Ribbon when you start Excel

[rediffusion]

I added my add-in to Excel. Used "XML" to call from inside keytip="BP" and ******="ChooseTab". Running "MyExcelAddin.xlam" - It's WORK!
But! The fact is that after I go to the developer tab > Excel add-Ins = there I choose my add-in... When i open the add-in or any other Book, and boom doesn't WORK already! WTF I did not understand!?
Anyways does not work after setting the tick!

Found on one portal StackOverflow, need to use "OnTime" instead of "Wait" or "Sleep". Seems like "Ontime" was not blocking the custom Ribbons from loading.
But I couldn't find the right code.

XML:

 <!--?xml version="1.0" encoding="UTF-8" standalone="yes"?-->
<customui xmlns="http://schemas.microsoft.com/office/2009/07/customui" ******="<strong><font color=" #2f4f4f"="">ChooseTab">
    <ribbon startfromscratch="false">
        <tabs>
            <tab id="mytab_1" label="My Macros" keytip="BP">
                <group id="Sheets" label="Листы">
                    <button
                        idMso="About"
                        label="Show About"
                        screentip="Bla bla bla"/>
            </button
</group></tab>
        </tabs>
    </ribbon>
</customui>

VBA:

 ' (component: customUI, atribut: ******), 2010
Sub [B][COLOR=#2F4F4F]ChooseTab[/COLOR][/B](ribbon As IRibbonUI)
    SendKeys "%BP{F6}"
End Sub

P.S. :
"Office 2019"
"Microsoft Windows 10 Enterprise 2016 LTSB"