I often run into situations where I have to thank somebody for doing two
things in business emails. The sentence would essentially be:

> “Thank for doing A and B.”

I am thinking something around the lines of :

> “Aをさせていただき、Bをしていただきありがとうございました。”

A more concrete example:

> “Thank you for meeting with me and updating the schedule.”  
> お話しをさせていただき、日程を調整いただきありがとうございました。

The redundant use of Itadaki makes me feel uneasy and seems unnatural. Any
thoughts on this are much appreciated.
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keigo business-japanese
How do you thank somebody for doing two things in Keigo?
First, let's start with your example sentences, because you aren't saying what
you think you are saying...

> Aをさせていただき、Bをしていただきありがとうございました。

Loosely translates to:

> Thank you for letting _me_ do A, and thank you for doing B.

As has been pointed out in one of the comments below your post, using the
causative form + itadaku results in a 'letting (speaker) verb' construction.
Here's why, the causative form of the verb (～させる) is a form for either
'letting' or 'making' someone verb. いただく is a verb for the speaker to receive
something from someone else. When you say ～させていただく, you are literally
receiving of someone letting the _speaker_ (verb).

This is not the case for ～していただく which is where the _speaker_ receives of the
_other_ person verbing.

There are a few cases where the causative form _can_ be used, like the verb
話す. However, in that case, you are still humbly receiving of their letting you
talk (to/with them). The only reason this can work is because 話す implies
speaking with the other person. In cases of using keigo, you can also use
verbs in which someone else gives to the speaker, like くださる.

You are right to point out that it is repetitive, because it is. That's just
how keigo can go sometimes.

You can link the two different ideas/phrases by using the て conjugation.
Another alternative is to use some other conjunctive form, and then using そして
or また for the next idea. Also, because this is keigo, it isn't a bad idea to
make sure that you acknowledge the time that the spent doing that thing for
you.

After talking briefly with some Japanese friends そして is not as common as また.
Also, their examples all showed that いただく and くださる are repeated for each of
the tasks being performed. (Thanks @Chocolate!)

> Aをしてくださり、また、Bもして くださって/くださいまして、ありがとうございました。  
>  Thank you for doing A and B.

If you were a business executive (CEO or vice president level) meeting with
regular staff, you may hear くれる. Neglecting this edge case, I would always
recommend using the honorific in keigo.

* * *

As has been noted by others, you may not want to combine two things into one
sentence when thanking. Keigo is round about enough that giving each thing its
own sentence and recognition is in itself part of the formality. That being
said, if I were to combine the actions in your example sentence, I would say
the following (with special recognition from those that have helped me reach
this conclusion):

> Thank you for meeting with me and updating the schedule.  
>  お忙しい中お時間を [頂]{いただ}き/[頂戴]{ちょうだい}し、また、日程調整もしていただきまして、（誠に）ありがとうございました。
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answer
> “Thank for doing A and B.”

  * AもBもなさっていただき、誠にありがとうございました。

「なさる」 is the sonkeigo of する。And 「いただく」 is the kenjyougo of もらう, so that
doubles-up on the 敬語。And then, I think it is grammatically correct, but sounds
sort of funny / quirky to add in a "つつしむ", which makes it sort of sounds like
you are rebuking yourself for even having asked him / her for having done
anything on your behalf. But, I'd not add that extra in a formal email. Just
in a very casual conversation, especially if you've insisted you have poor
Japanese skills:

  * AもBもなさっていただき、つつしんで誠にありがとうございました。

> “Thank you for meeting with me and updating the schedule.”

  * お話しかけてありがとうございました。"Thank you for meeting with me."

The "お" is called "bikago"美化語 which makes the verb 話しかける an honorific. And,
once honorifics are involved, then first and second person in a sentence
usually can become implied. The implied first person is usually the listener.
The speaker is usually the implied second person. With this honorific "with
me" is implied.

スクシュールを添削できてありがとうございました。"Thank you for updating / correcting the schedule."
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answer